Set-aside was an incentive scheme introduced by the European Economic Community (EEC) in 1988 (Regulation (EEC) 1272/88), to (i) help reduce the large and costly surpluses produced in Europe under the guaranteed price system of the Common Agricultural Policy (CAP); and (ii) to deliver some environmental benefits following considerable damage to agricultural ecosystems and wildlife as a result of the intensification of agriculture.
It sought to achieve this by requiring that farmers leave a proportion of their land out of intensive production. Such land is said to be 'set-aside'.